Primary database

This paper presents a comprehensive scientometrics on the existing trend on mesoporous materials in chemistry. The study uses Web of Science database as the primary source of value added articles and performs different methods for detecting highly cited articles, most active countries, etc.

18p tocectocec 25-05-2020 14 1   Download

Giáo trình cung cấp cho người học các kiến thức: Cơ sở dữ liệu (Database). Hi vọng đây sẽ là một tài liệu hữu ích dành cho các bạn sinh viên đang theo học môn dùng làm tài liệu học tập và nghiên cứu.

48p hpnguyen9 27-04-2018 51 3   Download

In this chapter you will: To understand how firms create an internal database, to learn about building a database from a Web site, to become familiar data mining, to understand the advantages and disadvantages of of using secondary data, to understand the role of the Internet in obtaining secondary data, to learn about types of information management systems.

13p allbymyself_06 28-01-2016 62 4   Download

Chapter 10 present functional dependencies and normalization for relational databases. This chapter includes contents: Informal design guidelines for relational databases, functional dependencies (FDs), normal forms based on primary keys, general normal form definitions (For Multiple Keys), BCNF (Boyce-Codd Normal Form).

49p kiepnaybinhyen_04 15-12-2015 66 3   Download

Angiotensin converting enzyme (ACE) was already discovered in insects in 1994, but its physiological role is still enigmatic. We have addressed this problem by purifying four new ACE substrates from the ovaries of the grey fleshfly, Neobellieria bullata. Their primary structures were identified as NKLKPSQWISLSD (Neb-ODAIF-11)13), NKLKPSQWI (Neb-ODAIF-11)9), SLKPSNWLTPSE (Neb-ODAIF-2) and LEQIYHL. Database analysis showed significant homology with amino acid sequence stretches as present in the N-terminal part of several fly yolk proteins....

9p research12 01-06-2013 36 3   Download

After completing this lesson, you should be able to do the following: Describe the features of multitable inserts Use the following types of multitable inserts Unconditional INSERT Pivoting INSERT Conditional ALL INSERT Conditional FIRST INSERT Create and use external tables Name the index at the time of creating a primary key constraint

30p trinh02 28-01-2013 50 6   Download

After completing this lesson, you should be able to do the following: Describe different system architectures Describe the primary steps of OS tuning Identify similarities between OS and DB tuning Understand virtual memory and paging Explain the difference between a process and a thread

14p trinh02 28-01-2013 46 5   Download

Data Integrity Data integrity means that data in a database adheres to business rules. There are three primary ways in which data integrity can be maintained: Application code Database triggers Declarative integrity constraints Mapping the business rules using one of the three methods is a design decision. The database administrator is primarily concerned with implementing the methods chosen by the designer and balancing the performance needs against integrity requirements.

34p trinh02 28-01-2013 51 5   Download

A sequence: Automatically generates unique numbers Is a sharable object Is typically used to create a primary key value Replaces application code Speeds up the efficiency of accessing sequence values when cached in memory

28p trinh02 28-01-2013 42 2   Download

Overview of Primary Components The Oracle architecture includes a number of primary components, which are discussed further in this lesson. Oracle server: There are several files, processes, and memory structures in an Oracle server; however, not all of them are used when processing a SQL statement. Some are used to improve the performance of the database, to ensure that the database can be recovered in the event of a software or hardware error, or to perform other tasks necessary to maintain the database. The Oracle server consists of an Oracle instance and an Oracle database.

48p trinh02 28-01-2013 92 8   Download

Storage devices hold data, even when the computer is turned off. The physical material that actually holds data is called a storage medium. The surface of a floppy disk is a storage medium. The hardware that writes data to or reads data from a storage medium is called a storage device. A floppy disk drive is a storage device. The two primary storage technologies are magnetic and optical.

28p trada85 18-01-2013 95 10   Download

GUIDELINE 3: Relations should be designed such that their tuples will have as few NULL values as possible  Attributes that are NULL frequently could be placed in separate relations (with the primary key)  Reasons for nulls: attribute not applicable or invalid attribute value unknown (may exist) value known to exist, but unavailable

60p thienthanoze 12-11-2012 53 3   Download

For each weak entity type W in the ER schema with owner entity type E, create a relation R and include all simple attributes (or simple components of composite attributes) of W as attributes of R. In addition, include as foreign key attributes of R the primary key attribute(s) of the relation(s) that correspond to the owner entity type(s). The primary key of R is the combination of the primary key(s) of the owner(s) and the partial key of the weak entity type W, if any.

32p thienthanoze 12-11-2012 55 2   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Classification of unknown primary tumors with a data-driven method based on a large microarray reference database

12p panasonic02 15-12-2011 58 4   Download

Background: Pancreatic cancer is one of the most aggressive human tumors due to its high potential of local invasion and metastasis. The aim of this study was to characterize the membrane proteomes of pancreatic ductal adenocarcinoma (PDAC) cells of primary and metastatic origins, and to identify potential target proteins related to metastasis of pancreatic cancer.

13p toshiba23 18-11-2011 75 2   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Treating patients with fibromyalgia in primary care settings under routine medical practice: a claim database cost and burden of illness study...

14p thulanh14 17-10-2011 54 3   Download

Các phiên bản của SQL Server: Enterprise, Personal, Desktop, Developer,.. Các bộ phận của SQL Server: Enterprise Manager, Query Analyzer, Books Online,.. Các loại tập tin của SQL Server: data file (primary, secondary), log file Các loại cơ sở dữ liệu của SQL Server: system database, user database

10p whylove1020 06-04-2011 129 24   Download

Trên cơ sở dữ liệu (database): Các phiên bản của SQL Server: Enterprise, Personal, Desktop, Developer,.. Các bộ phận của SQL Server: Enterprise Manager, Query Analyzer, Books Online,.. Các loại tập tin của SQL Server: data file (primary, secondary), log file; Các loại cơ sở dữ liệu của SQL Server: system database, user database.

10p trinhhiephoa 30-12-2010 271 111   Download

[ Team LiB ] Recipe 6.9 Retrieving Constraints from a SQL Server Database Problem You need to programmatically define constraints in a DataSet and retrieve constraint information defined in a SQL Server database. Solution Use the INFORMATION_SCHEMA views and SQL Server system tables to get information about primary keys, foreign keys, and check constraints.

7p luvpro 04-08-2010 120 5   Download

[ Team LiB ] Recipe 4.4 Getting a Sequence Value from Oracle Problem When you add a row into an Oracle table that uses a sequence to generate the value for a primary key column, the value assigned to the column in the DataTable is replaced by a value generated by the database.

4p luvpro 04-08-2010 101 5   Download